Friction draft-gear



H. YOERG.

FRICTIUN DRAFT GEAR.

APPLICATION FILED 1AN.5.191 8.

Patented May 4, 1920.

w l/IIII nu W /NVENTORJ Rf NTED STATES "PATENT OFFC.

HENRY YOERG, 0F' ST. PAUL, MINNESOTA.

FRICTION DRAFT-GEAR.

Specification of Letters Patent.

Patented May 4, 1920.

Application filed January 5, 1918. Serial No. 210,485.

The object of my invention is to providemeans in connection with the draw-bar of a car, particularly a freight car, for taking up thestrain on the draft gear resulting from the sudden starting-or stopping of the car.

A further object is to provide an attachment of comparatively simple construction and one which will be strong and durable.

@ther objects of the invention will appear from the following detailed description.

The invention consists generally in various constructions and combinations, all as hereinafter described and particularly pointed out in'the claims.

1n the accompanying drawings forming part ofl this specification,

Figure 1 is a plan sectional view of a portion of`a draw-bar and friction attachment orconnection, showing the preferred means for mounting it on the frame of the car,

Fig. 2 is a longitudinal vertical section through a car platform and the friction attachment,

Fig. 3 is a transverse sectional view through the friction attachment, showing its position between'the sills of the car,

Fig. e is a perspective view of a portion of one of the castings on which the friction' attachment is supported,

Figs. 5 and 6 are detail' views of the friction block device for resisting movement of the draw-bar in either direction,

Fig. 7 is a detail view of a modified construction.

In the drawing, 2 represents the platform of a car, 3 the portion of the frame at the end of the car and 4 parallel sills arranged beneath the car platform and-spaced apart to provide room for the draw-bar and connections between them. 5 represents castings having horizontal flanges 6 and fitting the inner and under faces of the sills 1 and secured thereto by suitable means, such as bolts 7. The lower edges of these castings are provided with horizontal flanges 8 and the inner opposing faces of the castings have shoulders or projections 9 and 10 formed thereon and provided with recesses 11 and opposing faces or seats 12.` 13 represents a draw-bar and 111 is a casting arranged between the castings 5 and having projections 15 and 16 formed thereon in position to contact with the blocks 9 and 10 when an outward pull is yimpartedio the draw-bar.

The casting 14 has laterally extending chambers 17 therein and a recess 18 betweenr said chambers. Friction blocks 19 are provided in saidl chambers, the walls of which are arranged to flare slightly so that said blocks will be vdrawn together as they are pushed into the chambers against the tension of the compression springs 20. A block 21 has a double cone-shaped head 22 fitting into the chamber 18 between the friction blocks 19 and blocks 23 polygonal, substantially, in form, are interposed between the double cone faces of the head 22 and inclined faces 24 provided on the blocks 19. Vhen, therefore, a push or pull is imparted to the block 21, an outward pressure will be exerted upon the friction blocks to force them into the chambers 19 against the tension of their springs and resist such movement of the blocks. The draw-bar has a slot 25 therein and links 26 are provided upon each side of the castings between the projections 15 and 16 and fitting within the recesses 11 formed inthe blocks 9 and 10 and these links have slots 27 opposite the slot 25 in the drawbar and a tongue or key 28 is fitted into these slots in the links and draw-bar for securing them together.

At the inner ends of the castings the block 21 and its parts are duplicated and I will indicate them by the same reference nu meral with the addition of the exponent a', 'chambers 171 being formed in the casting 29. Compression springs 3() and 31 are provided between ythe inner opposing ends of the blocks 21 and 21a. The inner end of the casting 29 has a transverse slot 32 therein to receive a key 33, the ends of which project outwardly on each side beyond the casting into elongated slots 34 and 35 provided respectively in the castings 5 and in the link 26. This key fits snugly in the slot in thecasting 29. The slots 341 and 35 allow the links to slide on the key 33 independently of the casting 29 and also allow the key 33 to slide in the supporting castings with the movement of the castings 29.

In Fig. 7 I have shown a modified construction which consists in substituting rollers 36 for the block 23, the rollers bearing on the double cone faces of the head 22 and friction members 19 pressed inwardly by springs 20 and resisting a pushing or pulling action on the head 22.

In the operation of the draft gear, when a pull is applied to the draw-bar 13, the casting 111 being in contact with the lugs 9 and 10 will be held thereby against outward movement. The pull on the draw-bar will then be transmitted through the key 28 and the bars 26 to the key 33 and the casting Q9. The key 33, being free to slide in the slots 34, will be drawn outward with the casting 29 and pressure will be applied to the heads 21 and 21a, movement of which will be resisted by the laterally arranged friction devices and by the springs 30 and 31 interposed between the heads of the blocks 21 and 21a and thereby a yielding cushion or buffer will be formed to take up the strain on the draw-bar.

In ease of inward pressure on this bar,

the key 33, being in contact with the inner ends of the slots 34, will prevent inward movement of the castings 29 and 14a, the bars 26 vbeing free to slide inward on the key 33. During this inward movement, the pressure will be transmitted through the draw-bar to the casting 111CL and the heads 21 and 212L will be subjected to this pressure, the laterally-arranged friction blocks and springs resisting inward movement of the heads, while the springs 30 and 31 will again be compressed to separate the heads when the pressure of the drawbar is released. Provision is thereby made for yieldingly resisting any eXtreme pull or pressure on the draw-bar, which might otherwise break or damage it or its connections.

I claim as my invention:

1. The combination, with a car and its draw-bar, of laterally movable friction blocks mounted to yieldingly resist outward and inward strain on said bar, a member having chambers to receive said blocks, the walls of said chambers being adapted to force the blocks therein toward each other during their outward movement.

2. The combination, with a car and its draw-bar, of double cone-shaped heads connected with said bar and having a limited longitudinal movement and yieldingly mounted friction blocks mounted to be put under compression during the longitudinal movement of said heads in either direction, said blocks being formed in sections and means for forcing said sections toward each other when subjected to outward pressure.

3. The combination, with a draw-bar, of a double cone-shaped head connected therewith, a casting wherein said head is mounted, stops for limiting outward movement of said casting, friction blocks mounted for lateral movement in said casting, and bearing on said cone-shaped head and means yieldingly resisting outward movement of said blocks.

1. rIhe combination, with a draw-bar, of links connected therewith, a casting having laterally arranged chambers formedv therein, stops for limiting outward movement of said` casting, friction blocks yieldingly mounted in said chambers, a head interposed between said blocks and means for transmitting the pull of said links to said head.

5. The combination, with a draw-bar, of links connected therewith, a casting having chambers formed therein, laterally moving friction blocks yieldingly mounted in said chambers, stops for resisting outward movement of said casting, a double cone-shaped head interposed between said friction blocks, and means for transmitting the pull of said links to said head.

6. The combination, with a draw-bar, of links connected therewith, castings inter posed between said links and having laterally projecting chambers formed therein, frictionV blocks yieldingly mounted in said chambers, heads interposed between said blocks, springs normally holding said heads apart, said castings and said heads being mounted to yieldingly resist longitudinal movement of said draw-bar in both directions.

7. The combination, with a car and its draw-bar, of a member having laterally arranged chambers therein, friction blocks composed of sections tting within said chambers and springs for normally holding said blocks at the limit of their inward movement, said chambers having walls for drawing said block sections together when outward pressure is applied thereto and said draw-bar having a head between said blocks for exerting an outward pressure thereon.

8. The combination, with a car, of bars mounted in parallel relation thereon and having projections or lugs in opposing relation at one end and guides between said lugs, links slidable in said guides, a draw-bar con nected at one end with'said links, a casting interposed between said links and contacting with said stops for limiting its outward movement, laterally moving friction blocks mounted in said casting, a head fitting between said blocks, and means connected with the inner ends of said links for applying pressure to said head and forcing said blocks outwardly, for the purpose specified.

9. A friction draft gear comprising a draw-bar, a head thereon, a body having chambers therein on each side of said head, the walls of said chambers being inclined or tapered, friction blocks tting within said chambers and springs for normally resisting outward movement of said blocks therein, and said head being mounted to exert an outward pressure on said blocks.

10. A friction draft gear comprising heads arranged end to end, a spring interposed between said heads for resisting movement thereof toward each other, said heads having double cone-shaped ends, friction blocks seated in said cone-shaped ends, means yieldingly resisting` lateral movement of said blocks, and a coupler bar connected with said heads.

11. A friction draft gear comprising heads and means for yieldingly resisting relative movement of said heads toward each other, laterally movable friction blocks seated on said heads, said blocks being composed of sections and springs for normally holding,

said sections toward said heads, and blocks interposed between said sections and said heads for transmitting pressure from said heads to said sections.

12. A friction draft gear comprising a coupler yoke, a draw-bar connected therewith, a member having chambers therein, friction blocks fitting within said chambers, springs for yieldingly resisting outward movement of said blocks in said chambers, and blocks interposed between said friction blocks and said coupler yoke for transmitting the pull of said draw-bar to said friction blocks.

13. The combination, with a draw-bar, of a coupler yoke having chambers therein, friction blocks composed of sections fitting within said chambers, springs for yieldingly resisting outward movement of said blocks in said chambers, the walls of said chambers being arranged to force said sections toward each other when outward pressure is exerted thereon, and a member mounted to exert pressure on said blocks and connected with said draw-bar.

In witness whereof, I have hereunto set v 

